Question

Evaluate the function rule for the given value. f(x) = 3x for x = –5

Answer 1

Answer: f(-5)=-15

Knowing that x=-5, let’s substitute that into everywhere we see x in the equation

f(x)=3x

f(-5)=3(-5)

Now let’s solve that

f(-5)=-15

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Answer 2

f(-5) = -15

Explanation:

Put the value where x is and do the arithmetic.

f(-5) = 3(-5) = -15

The value of f(-5) is -15.